Product Info


JRS-34 Active Ribbon Microphone Specs

Handcrafted in Tucson, AZ USA

Polar pattern: Fig 8 w/ -35db null at 90°
Dimensions: 7.75” x 3” x 1.75”
Weight: 1.03lbs
Generating Element: 1.8 Micron Ribbon
Frequency Response: 20 HZ – > 20kHz
Output Sensitivity: -27 dBv/Pa
Max SPL: 138 dB > 1kHz
Out Impedance (in Ohms): 150 ohms
Recommended Load (in Ohms): 1kohm or greater
Powering Type: +48v Phantom Power
Powering Alternative: +24v Phantom Power
Supply Current: 4mA
Connection Via: XLR
Supplied Accessories: Wood Case, Mic cover
Optional Accessories: Cloud U1 Shockmount

Technical Info

Cloud Microphones JRS-34 Active Ribbon Microphone

From direct RCA* lineage comes the best of the vintage style ribbon sound. Handcrafted entirely in the US, the JRS-34 combines the best attributes of vintage and modern technologies to create a high-quality active ribbon microphone ideally suited for music and voice. The active JRS-34 requires phantom power and has an output level compatible with virtually any modern preamp. Included is a beautiful handcrafted wooden box and a microfiber mic cover, designed to properly store and clean the microphone.

Designed in collaboration with Stephen Sank, the Cloud® ribbon mics were given the model number prefix JRS in homage to the late Jon R. Sank, Stephen Sank’s father (1934-1998). Known for his work with RCA that produced legendary microphones such as the BK-11 and BK-10A, the senior Sank succeeded RCA’s Harry Olson as the guiding force behind the company’s continuing development of ribbon microphones.

Built upon the shoulders of giant RCA mics, each JRS-34 ribbon is cut, corrugated, and installed by hand in precisely the same fashion as prescribed by Olson. New ideas expand the performance capabilities as well, bringing the design into the 21st century with the addition of custom audio transformers by CineMag Inc., internal spring mounted suspension, patented rounded magnet, active “Cloudlifter®” JFET technology, and much more.


· Figure 8 polar pattern, excellent side null rejection
· Patented Rounded Magnet technology
· Phantom Powered “Cloudlifter” Class A, Discrete Circuity
· Frequency Response: 20 Hz to above 20 kHz
· Maximum SPL: 138 + dB SPL above 1 kHz
· Output Sensitivity: -27 dBv/Pa
· Ribbon element dimensions: .19 inches wide, 2.35 inches long, 1.8 microns thick
· New mount offers 180 degree range of motion
· Internally shock mounted
· Built in XLR connector
· 2 year ribbon warranty
· Free limited lifetime warranty on all other parts, with registration
· Handmade entirely in the USA

*RCA is a registered trademark of Radio Corporation of America. References to RCA are historical in nature and imply no affiliation with Cloud Microphones.

How To

University of Arizona Professor Wiley Ross on recording with Cloud mics

Bryan Clark tracking Southern Intermission with the JRS-34, JRS-34-P


Awards and Nominations

2013 Editors Choice Award Professional Audio Magazin

Cloud JRS-34 2011 MIPA Musikmesse International Press Award Nominee Category: Microphones


RoHS Compliance

Date of RoHS Compliance:
March 1, 2010
Statement Updated for RoHS II: May 18, 2015

To Cloud Microphones Customers in the European Union:

Directive 2011/65/EU of the European Parliament and of the Council of 8 June 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment (the “RoHS Directive”) restricts the use of the hazardous substances in electrical and electronic equipment. The policy of Cloud Microphones is to comply with all applicable laws of all jurisdictions where our products are distributed, including the RoHS Directive.

Cloud Microphones maintains a rigorous program designed to ensure compliance of all its products with the RoHS Directive, and takes the following measures, among others, as we have deemed appropriate:

  • Maintains official confirmation and certification from suppliers as to compliance of their parts and other materials with the RoHS Directive
  • Performing material content testing
  • Where applicable, new compliant materials replaced non-compliant material
  • Maintains inventory and records to confirm, document, identify, and segregate compliant products and materials from non-compliant products and materials
  • Maintains parts manufacturing and processes that are 100% RoHS compliant for every product
  • Appropriate labeling of products (or packaging)

Based on our RoHS Directive compliance program, Cloud Microphones certifies to you that to the best of our knowledge all Cloud Microphones products marketed by Cloud Microphones or Cloud Microphones’ authorized distributors in the European Union, on or after March 1, 2010, are in compliance with the RoHS Directive and RoHS II.